Compilare: user.cpp: In function ‘int main()’: user.cpp:47:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[a].size()&&ok==0;j++) ^ user.cpp:49:32: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(b<=v[a][j].first&&c<=v[a][j].second||c<=v[a][j].first&&b<=v[a][j].second) ok=1; ^